.net WPF打印以适应页面

我搜索了如何打印WPF控件的选项，并找到了一些解决方案。我确实需要在保持纵横比的同时将打印控件与打印页面相匹配（我的控件是正方形；数独网格）

我找到了一个解决方案，可以调整控件的大小和位置以适应页面。这很好，但它也可以在我的窗口上重新定位该控件

以下是我用于打印和缩放的代码：

        //get selected printer capabilities
            System.Printing.PrintCapabilities capabilities = dialog.PrintQueue.GetPrintCapabilities(dialog.PrintTicket);
        //get scale of the print wrt to screen of WPF visual
        double scale = Math.Min(capabilities.PageImageableArea.ExtentWidth / mrizka.ActualWidth, capabilities.PageImageableArea.ExtentHeight / mrizka.ActualHeight);

        //Transform the Visual to scale
        mrizka.LayoutTransform = new ScaleTransform(scale, scale);

        //get the size of the printer page
        Size sz = new Size(capabilities.PageImageableArea.ExtentWidth, capabilities.PageImageableArea.ExtentHeight);

        //update the layout of the visual to the printer page size.
        mrizka.Measure(sz);
        mrizka.Arrange(new Rect(new Point(capabilities.PageImageableArea.OriginWidth, capabilities.PageImageableArea.OriginHeight), sz));

        dialog.PrintVisual(mrizka, mrizka.getID().ToString());

我尝试了两种方法来解决这个问题：

克隆我的控件，然后转换克隆的控件，不影响原始控件。 不起作用，出于某种原因，我以例外结束：提供的DependencyObject不是这个Freezable的上下文，但奇怪的是，只有在某些情况下

恢复大小和位置更改。我尝试调用InvalidateArrange（）方法，这似乎有效，但仅在第一次调用print方法时有效。在第二次通话中，它不起作用

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我该怎么办，有什么想法吗？<谢谢。

我知道这个问题很老了，但我自己正在寻找解决这个问题的办法。这是我目前使用的解决方案。我针对框架元素存储原始转换，然后在打印完成后重新应用它

    private void Print(Visual v)
    {

        System.Windows.FrameworkElement e = v as System.Windows.FrameworkElement ;
        if (e == null)
            return;

        PrintDialog pd = new PrintDialog();
        if (pd.ShowDialog() == true)
        {
            //store original scale
            Transform originalScale = e.LayoutTransform;
            //get selected printer capabilities
            System.Printing.PrintCapabilities capabilities = pd.PrintQueue.GetPrintCapabilities(pd.PrintTicket);

            //get scale of the print wrt to screen of WPF visual
            double scale = Math.Min(capabilities.PageImageableArea.ExtentWidth / e.ActualWidth, capabilities.PageImageableArea.ExtentHeight /
                           e.ActualHeight);

            //Transform the Visual to scale
            e.LayoutTransform = new ScaleTransform(scale, scale);

            //get the size of the printer page
            System.Windows.Size sz = new System.Windows.Size(capabilities.PageImageableArea.ExtentWidth, capabilities.PageImageableArea.ExtentHeight);

            //update the layout of the visual to the printer page size.
            e.Measure(sz);
            e.Arrange(new System.Windows.Rect(new System.Windows.Point(capabilities.PageImageableArea.OriginWidth, capabilities.PageImageableArea.OriginHeight), sz));

            //now print the visual to printer to fit on the one page.
            pd.PrintVisual(v, "My Print");

            //apply the original transform.
            e.LayoutTransform = originalScale;
        }
    }

这是对用户1018711提出的问题的回答。使用C#和WPF在一个打印机页面上安装打印输出。当您想要打印一个可视控件时，它可能是一个控件，可能包括许多控件（例如按钮、数据网格、文本块、标签等）。这里我想将名为song2Drid的数据网格打印到打印机上，但其内容大于打印机的页面大小（其宽度大于纸张宽度），所以被截断。我看不到所有这些，所以我必须缩放视觉效果，但我想保持比例与旧的一样

我还将纸张的边距设置为纸张两侧各0.75英寸，包括左侧、顶部、右侧和底部。我还将visual（song2Grid）的内容集中在纸上。所以我可以在纸的中央看到印刷的内容。但是，如果该可视化对象是类似于窗口的Application.Current.MainWindow或由new window（）以编程方式创建的任何窗口，则不会对其进行缩放。这意味着此方法不适用于窗口对象

另外，如果您想通过缩放到打印来恢复屏幕上的原始外观，那么您必须有如下语句

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win.LayoutTransform=旧LayoutTransform；win.Measure（旧尺寸）；win.Arrange（新矩形（新点（0,0），旧尺寸））

您需要添加对System.Printing和ReachFramework的引用。它似乎还引用了System.Windows.Media和System.Windows.Controls。这对我来说不正常，无论我对布局转换进行何种转换，它似乎都会被忽略。

    private void DrawGrap_Click(object sender, RoutedEventArgs e)
    {
        // Visual v = sender as Visual;
        Visual v = song2Grid as Visual;   // the object (it is a DataGrid) that you want to print out, not a window
        PrintDialog prtDlg = new PrintDialog();
        if (prtDlg.ShowDialog() == true)
        {
            // because 96 pixels in an inch for WPF window
            double marginLeft = 96.0 * 0.75; // left margin is 0.75 inches
            double marginTop = 96.0 * 0.75; // top margin is 0.75 inches
            double marginRight = 96.0 * 0.75; // right margin is 0.75 inches
            double marginBottom = 96.0 * 0.75; // bottom margin is 0.75 inches

            // the following steps do not works for a WPF window
            FrameworkElement win = v as FrameworkElement;
            Transform oldLayoutTransform = win.LayoutTransform;
            Size oldSize = new Size(win.ActualWidth, win.ActualHeight);

            System.Printing.PrintCapabilities pCapability = prtDlg.PrintQueue.GetPrintCapabilities(prtDlg.PrintTicket);

            // calculate print area that you want
            double printWidth = (pCapability.PageImageableArea.ExtentWidth - pCapability.PageImageableArea.OriginWidth)
                                - (marginLeft + marginRight);
            double printHeight = (pCapability.PageImageableArea.ExtentHeight - pCapability.PageImageableArea.OriginHeight)
                - (marginTop + marginBottom);

            // calculate the scale
            double scale = Math.Min(printWidth / oldSize.Width , printHeight / oldSize.Height);
            if (scale > 1.0)
            {
                // keep the original size and layout if printable area is greater than the object being printed
                scale = 1.0; 
            }

            // store the original layouttransform
            win.LayoutTransform = new ScaleTransform(scale, scale);

            // new size of the visual
            Size newSize = new Size(oldSize.Width*scale , oldSize.Height*scale);
            win.Measure(newSize);

            // centralize print area
            double xStartPrint = marginLeft + (printWidth - newSize.Width)/2.0;
            double yStartPrint = marginTop + (printHeight - newSize.Height)/2.0;
            win.Arrange(new Rect(new Point(xStartPrint,yStartPrint),newSize));

            // print out the visual
            prtDlg.PrintVisual(win as Visual, "PrintTest");

            // resotre the original layouttransform and size on screen
            win.LayoutTransform = oldLayoutTransform;
            win.Measure(oldSize);
            win.Arrange(new Rect(new Point(0,0),oldSize));
        }
    }